You can set up a 4G dongle and use it as a hotspot for iGrid. You will still have to plug a WIFI adapter into your PAW, so the PAW can connect to your 4G dongle.
I have one and it's great that I don't have to muck around with phone hotspots. Just recently I couldn't get anything through iGrid but I discovered, yesterday, that GiffGaff have not topped up the sim card as they should have done. Small wonder there's no data when I haven't paid for it
I have varying results. Sometimes it works better than my iPhone and other times it doesn't. It's mounted underneath my seats and has a clear view of the ground etc through fabric.
Lee advised NOT to use the PAW USBs to power the dongle. They can take a bit of electricity and that might upset your PAW. Best to use a separate source, as I have.
Once your 4G dongle connects to iGrid (via the WIFI adapter in your PAW) it will allow the weather/rainfall to be displayed and it will enhance the traffic you see.